Bobbin



J. D.JOYCE.

Patented Nov. 14, 19225.

Patented Nov. 14 lQZZ.

JAMES D, JOYCE, F PHILADELPHIA, PENNSYLVANIA.

BOBBIN.

Application filed June 4;

To all whom it may concern: 5

delphia, in the State of Pennsylvania, have I invented certain new anduseful Improve I ments in Bobbins, of which the following is i which isa specification. K

' This invention relates to bobbins designed for holding yarnof variouskinds and sizes, the object in view being to produce economically abobbin which will hold the smoothest yarn in such manner as to preventthe same from creeping upwardly or longitudinally of the stem of thebobbin, either duringthe process of winding the bobbin or during theoperation of unwinding the bobbin, permitting the yarn to have a muchfreer ballooning or unwinding action during the knitting operation,which, as is well known, is a very desirable feature. In some cases theyarn has more or less moisture con tent during the winding-operation andis apt to-become loose in the package as the yarn dries out after thewinding operation is completed. Under the resent invention the yarn isheld'more effectively on the bobbin, even after becoming thoroughlydried out.

With the above and other objects in view, the invention consists in thenovel construe-- tion and arrangement herein fully describe-d,illustrated and claimed. In the accompanying drawings: Figure 1 is aside elevation of proved bobbin;

Figure 2 is adiametricalsection through the same;

Figure 3" is a cross-section on the line 3-3 the im' of Figure 2, takenthrough the metal sheath in -ofthe bobbin.

a he improved bobbin comprises a base 1 nerally cone-shaped and formedwith a m tiplicit of. annular steps 2, which serve to'prevent s ippageof the, yarn during the winding of the preliminary layers in;and'thebobbin further. comprises a spindle ofthe winding machine, the base 1 vof the bobbin'being countersunk to form a key-receiving recess 5 in thebottom thereof,

which recess receives a correspondingly shapedlprojectionon the windingmachine,

. thereby insuring the driving rotation of the 1921. Serial No. 474,961.

bobbin as a whole during the winding of the yarn thereon. The upperextremity of the stem is rounded or convex, as shown at 6.

In carrying out the present invention I make use of a suitable length oftubing, pref erably of thinsheet metal, forming a sheathing 7 whichsurrounds, encases and covers the bobbin stem. The sheathing 7 is swagedoutwardly along-spiral lines to form outwardlyembossed and projectinghollow yarn supporting ribs 8 of substantial size in cross-section, eachof said ribs extending approximately half-way around the sheathing andstem of the bobbin, as illustrated in the drawings, and terminatingshort of the top and bottom ends of the sheathing, as clearly shown. Theupper end portion of the sheathing is spun or peened inwardly, as shownat 9, soas to conform to and fit the corresponding rounded or convexupper extremity of the bobbin stem. Finally the sheathing is fixedlysecured to the stem of the bobbin by forming said sheathing withindentations or swaging'the same inwardly, preferably at diametricallyopposite points, as shown at 10, until ortions of the metal arepartially imbedded 1n the stem of the bobbin. This prevents any relativerotative or longitudinal movement of the sheathing with respect to thebobbin stem, the sheathing being thereby fixedly secured to the bobbin.

rom the foregoing description, taken in conjunction with theaccompanying drawings, it will now be understood that as the yarn iswound around the sheathed portion of the bobbin stem, said yarn willrest at least two points in each wrapping thereof upon the spirallydisposed raised ribs, and will also bear against the intervening smoothportions of the sheathing. ,As a result of this, the yarn will beprevented from slipping around. or longitudinally of the bobbin stem andwill be found a particularly desirable feature in case the yarn is woundupon the bobbin in a moist condition. The.

bobbin will hold the smoothest yarn from 3 creeping upwardly on the stemthereof,

either during the process ofwinding the yarn thereon, or in case theyarn dries out after the winding operation has been completed.

The bobbin is of special assistance knitting operations, I as the. yarnwill notv bind upon the bobbin,-but.rides u on the sidesandridgesthereof, enabling t'e same to unwind or balloon with muchfgreaterfreedom than is the case with the ordinary bin stem, of a sheathing tubefitted closely bobbin. The spiral ridges or ribs are of around the sameand swaged outwardly 10 ample size in cross-section and rounded in alonga plurality of spiralslines to form such manner as to avoid any tendencyto steeply pitched ribs eachextending less than 5 chafe or injure theyarn wound thereon. the full circumference of the tube.

Having thus fully described the inven- In testimony whereof I haveaffixed my tion, what is'claimed is: signature.

In a bobbin, the combination with a bbb- JAMES D.JOYCE.

